US4717801A - Dual induction heating pressure welding apparatus having a control circuit - Google Patents

Dual induction heating pressure welding apparatus having a control circuit Download PDF

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Publication number
US4717801A
US4717801A US06/896,904 US89690486A US4717801A US 4717801 A US4717801 A US 4717801A US 89690486 A US89690486 A US 89690486A US 4717801 A US4717801 A US 4717801A
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United States
Prior art keywords
temperature
articles
interfacing
coils
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/896,904
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English (en)
Inventor
Charles A. Brolin
Ronald L. Pike
Dennis A. Jennerjohn
Original Assignee
FMC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FMC Corp filed Critical FMC Corp
Priority to US06/896,904 priority Critical patent/US4717801A/en
Priority to AU74432/87A priority patent/AU590090B2/en
Priority to CA000540006A priority patent/CA1279904C/en
Priority to JP62161403A priority patent/JPS6348790A/ja
Priority to FR8709721A priority patent/FR2602445B1/fr
Priority to GB8718592A priority patent/GB2193917B/en
Priority to DE19873726586 priority patent/DE3726586A1/de
Priority to IT21625/87A priority patent/IT1222474B/it
Assigned to FMC CORPORATION, A DE CORP. reassignment FMC CORPORATION, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: JENNERJOHN, DENNIS A.
Application granted granted Critical
Publication of US4717801A publication Critical patent/US4717801A/en
Assigned to FMC CORPORATION, A DE CORP. reassignment FMC CORPORATION, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PIKE, RONALD L.
Assigned to FMC CORPORATION, A DE CORP. reassignment FMC CORPORATION, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BROLIN, CHARLES A.
Assigned to BROLIN, CHARLES A. reassignment BROLIN, CHARLES A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FMC CORPORATION
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K13/00—Welding by high-frequency current heating
    • B23K13/01—Welding by high-frequency current heating by induction heating

Definitions

  • the present invention relates to circuitry for controlling induction heating equipment, and more particularly to circuitry for sensing the temperature of articles to be welded, controlling heating currents so a pair of articles reach welding temperature substantially simultaneously allowing the articles to be forced together to provide a high strength weld.
  • the present invention discloses circuitry for controllling induction heating of a pair of articles to bring them to a welding temperature and for causing the heated articles to be pressed together to form a welded pair.
  • the articles are positioned adjacent to each other with a small gap between them and an induction coil is moved into the gap between the articles. Electrical currents through the induction coil causes the articles to be heated and a temperature sensor monitors temperature of the articles. When the articles reach a welding temperature a signal from the temperature sensor causes the induction coil to be retracted from the gap and causes the articles to be forced together to form a welded pair. Temperature of the articles can be more accurately controlled by using a pair of induction coils and a pair of temperature sensors.
  • a first temperature sensor monitors the temperature of a first article and a second temperature sensor monitors the temperature of a second article.
  • a circuit controls the amount of electrical current to each induction coil so both articles reach welding temperature at substantially the same time so the quality of the weld joint is very good. The use of two coils and two sensors is especially useful when the two articles differ in size, shape or material.
  • FIG. 1 is a diagrammatic view of welding apparatus used with the control circuitry of the present invention.
  • FIGS. 2A, 2B disclose a portion of the control circuit of the present invention.
  • FIG. 3 discloses circuitry for use with a pair of temperature sensors and a pair of induction coils to regulate the current to the individual induction coils.
  • the induction heating apparatus of FIG. 1 includes a pair of end plates 11, 12 interconnected by a pair of rigid support tubes 13, 14.
  • a hydraulic ram 18 having a cylinder 19 and a piston 20 is rigidly secured to the end plate 11 by a plate 24 and a plurality of bolts 25 with the cylinder 19 being secured to the plate 24.
  • a piston rod 26 attached to the piston 20 extends through a bushing 30 in a bore 31 of the plate 11.
  • the piston includes a plurality of annular sealing rings 32 mounted in a plurality of grooves 36.
  • An annular sealing ring 37 provides a seal between the piston rod 26 and the plate 24.
  • a conduit 38 selectively provides pressurized hydraulic fluid to extend the piston rod 26 to the left (FIG.
  • a conduit 39 selectively provides pressurized hydraulic fluid to retract the piston rod to the right.
  • a pair of fixtures 43, 44 are secured to the piston rod 26 and to the end plate 12 respectively.
  • a pair of articles 45, 46 are secured in the fixtures 43, 44 and a pair of induction coils 50, 51 are mounted between the articles to provide induction heat to the articles.
  • a pair of infrared pyrometers or other type of temperature sensors 52, 53 are mounted adjacent an inert gas chamber 57 to monitor the temperature of the articles 45, 46 through a pair of openings 60a, 60b in the chamber 57.
  • a temperature sensor module 58 which can be used with the present invention is the Model 9112E-F made by Williamson Corporation, Concord, Mass.
  • Terminal T3 of FIG. 2A is connected to terminal T3 of FIG. 2B and terminal T4 of FIG. 2A is connected to terminal T4 of FIG. 2B so FIGS. 2A, 2B form the power control circuit 70.
  • switches S2, S3 are closed to connect coils 50, 51 to a corresponding lead of the power supplies 68, 69 and switches S4A, S4B (FIG. 2A), S6 (FIG. 2B) are closed to provide voltage to one terminal of switch PB5A and switch contact K4A.
  • switches S4A, S4B are connected in the "temp" position the temperature in articles 45, 46 determines when current to coils 50, 51 is terminated.
  • switches S4A, S4B When switches S4A, S4B are connected in the "time” position the articles are heated for a predetermined amount of time which is determined by an adjustable time delay relay TDR (FIG. 2A).
  • TDR adjustable time delay relay
  • Switches S8 and S18 are also closed with S18 causing lamp L22 (FIG. 2B) to provide a light current to energize a photocell PE which energizes relay LC and closes contact LCA.
  • relay K8 With S8 and LCA closed relay K8 is energized causing contacts K8A, K8B to close and K8C to open, and energizing the pump solenoid S13 (FIG. 2B) to start a hydraulic pump to provide hydraulic pressure in the system.
  • a pressure switch (not shown) in a pressurized hydraulic supply 80 (FIG. 1) causes the switch PR (FIG. 2A) to close.
  • the hydraulic supply 80 may include a hydraulic pump (not shown) and an accumulator (not shown) so that a relatively small pump can be used and the supply 80 will have sufficient pressurized fluid to operate the ram 18 and other hydraulic devices at relatively high speeds when appropriate valves are actuated.
  • switch S9A FIG. 2B
  • a push button switch PB10 can be used instead of switch S9A to provide an intermittent movement of the clamping apparatus by holding PB10 closed for short periods of time.
  • switch S9A is placed in the lower or unclamp position an unclamp solenoid S12 is actuated so the articles 45, 46 are released.
  • a safety device includes a light curtain LC (FIG. 1) which extends from a light source L22 (FIGS. 1, 2B) across the front of the welding apparatus to a photocell PE so if a portion of a human operator or other object breaks the curtain of light between source L22 and the photocell PE causing the photocell PE to be rendered nonconductive.
  • PE FIG. 2B
  • the relay LC is deenergized causing contact LCA to open and deenergizing relay K8.
  • contact K8A opens deenergizing the hydraulic supply solenoid S13 so the hydraulic pump is shut down.
  • Contact K8C closes causing a hydraulic dump solenoid S14 to be energized so the hydraulic fluid is dumped from the accumulators.
  • Contact K8B (FIG. 2B) also opens deenergizing the forging valve solenoid S7 and disabling the forging valve 83 (FIG. 1). This prevents the ram 18 from being actuated and from moving articles 45 toward articles 46 and causing damage to any object which may be between these two articles.
  • An “emergency stop” push button PB2 (FIG. 2A) can be depressed to remove power from lines 75, 76 in an emergency situation.
  • a "cycle stop” push button PB4 can be depressed to stop operation of the device without removing power from the lines 75, 76.
  • the next step in the operation is to press the "arm air solenoid" push button closing switches PB5A, PB5B which energizes relays K4, K5 causing contacts K4A, K4B to close and causing contact K4C to open.
  • Contact K4A provides a bypass for switch PB5A, and contact K4B causes air solenoid S5 to be energized.
  • the energized air solenoid S5 causes the induction coils 50, 51 to be pulled into the gap between articles 45, 46.
  • the moving coil 50 physically closes the "coil arm contact” CARM (FIG. 2A) to energize relay K6 and close contacts K6A, K6B in the coil/power supply circuit (FIG. 2A).
  • a plurality of pilot lights PL1-PL16 are each connected in parallel with one of the relays and solenoids K1-K8, S1-S16 (FIGS. 2A, 2B) to provide a visual indication when the relays and solenoids are energized.
  • a pair of switches S4A, S4B are placed in an upper or temperature position so a pair of relay contacts CSET, DSET control current through relay K4.
  • coil current is to be provided for a predetermined amount of time the switches S4A, S4B are placed in a lower or time position so a pair of relay contacts TDRA, TDRB control current through relay K4.
  • a ram switch S10 controls extension and retraction of the hydraulic ram 18 when a switch S9B is in the unclamp position.
  • switch S10 When switch S10 is in the EXT position an extend solenoid S15 is energized to cause the ram to be extended.
  • switch S10 when switch S10 is in the RET position a retract solenoid S16 is energized to cause the ram to be retracted.
  • the solenoids S15, S16 allow small amounts of fluid to flow through conduits 38, 39 so the position of article 45 can be easily adjusted relative to the coils 50, 51.
  • forging solenoid S7 allows large amounts of fluid to flow through conduit 38 to drive the article 45 against article 46 when the coils 50, 51 are removed from between articles 45, 46.
  • the "start cycle switch" PB3 is depressed energizing relays K2, S1 (FIG. 2A) thereby closing contracts K2A, K2B.
  • Contact K2A bypasses switch PB3 and contact K2B connects relay K3 to the oxygen limit switch 02 which closes when an oxygen sensor 81 and an oxygen sensor unit 82 determine that the oxygen content in the inert gas chamber 57 (FIG. 1) reaches a predetermined low value.
  • One oxygen sensor unit 82 and sensor 81 which can be used in the present invention is the Model Thermox II made by Ametek Thermox Instrument Division, Pittsburgh, Pa.
  • the control circuit 59 (FIGS. 1, 3) monitors the temperature of the articles 45, 46 being heated and controls current to the inductor coils 50, 51 so both articles have the proper welding temperature when the articles are pressed together. This is done by reducing current to the coil adjacent the one article which is approaching welding temperature faster than the other article.
  • the control circuit 59 is adjusted to heat both articles to the same welding temperature.
  • the control circuit can be adjusted to heat the articles to different temperatures for best welding.
  • a pair of temperature transducers 86a, 86b (FIGS. 2B, 3) convert input temperatures into corresponding output voltages with input temperatures up to 1700° F.
  • the outputs of the transducers are coupled through a pair of switches S16, S17 (FIGS. 2B, 3) to a pair of signal conditioning circuits 87a, 87b in the control circuit 59.
  • the control circuit 59 (FIG. 3) includes a plurality of integrated circuits such as the 9,000 Series made by Daytonic Corporation, Miamisburg, Ohio. The Model Number of each of the Daytonic integrated circuits which can be used in the control circuit 59 is printed in the corresponding block of FIG. 3.
  • the output signal from temperature transducer 86a is amplified by the signal conditioning circuit 87a and the amplified signal applied to a comparator 88a.
  • a control circuit 92a provides a signal which sets the output level of comparator 88a. For example, a control signal from 92a may cause the output voltage from comparator 88a to have a value of zero until the input voltage reaches 0.1 volt, then the output voltage from comparator 88a increases in direct proportion to the input voltage.
  • Transducers 86b and integrated circuits 87b, 88b, 92b function in the same manner as elements 86a, 87a, 88a, 92a, and the output signal comparators 88a, 88b are coupled to a respective pair diodes 93a, 93b with the larger of the output signals being coupled to an integrator 94.
  • a control circuit 97 provides a control signal to a comparator 98 which compares this control signal with the level of the signal from the integrator 94. When the output voltage from the integrator 94 reaches the level of the voltage from the control 97 the integrator is put on hold and the integrator output voltage remains at the level of the control voltage.
  • the output voltage from the integrator 94, the signal from the signal conditioner 87a, and a "peak level" voltage from a level set circuit 99a are applied to a summing circuit 100a which developes an output voltage determined by the sum of the three input voltages.
  • the summing circuit 100a provides a voltage to a buffer 101a which amplifies the voltage and applies the amplified voltage to a signal conditioner 102a.
  • the signal conditioner 102a provides an output voltage Ao (FIGS. 1, 3) which causes the power unit 64 to provide an induction current to the corresponding induction coil 50.
  • the setting of a potentiometer 104a determines the heating rate of articles 50 (FIG. 1) by controlling the amplitude of signal Ao (FIGS. 1, 3).
  • signals from the integrator 94, the signal conditioner 87b and the level set circuit 99b are applied to a summer 100b which provides signal to the buffer 101b.
  • the signal from the buffer 101b causes the signal conditioning circuit 102b to supply a voltage Bo to the power unit 64 which in turn supplies an induction current through power supply 69 to the inductor coil 51.
  • the heating rate of the articles 45, 46 is also controlled by the setting of a potentiometer 105 by controlling the slope of the voltage waveform W3 at the output of integrator 94.
  • the summer 100a compares the slope of the signal waveform W1, from the temperature sensor 86a and signal conditioner 87a, with the slope of the voltage waveform W3. If the slope of waveform W1 is different than the slop of waveform W3 summer 100a provides an output voltage which causes voltage Ao to increase or decrease the heating rate of the article 45 (FIG. 1) so the slope of waveform W1 more closely conforms to the slope of waveform W3.
  • the summar 100b compares the waveform W2 with waveform W3 and provides an output voltage which causes voltage Bo to modify the heating rate of article 46 until the slope of waveform W2 closely conforms to the slope of waveform W3.
  • a potentiometer 106 controls upper temperature limits of the articles 50, 51 by limiting the maximum voltage into the summers 100a, 100b from integrator 94.
  • the output of the summer 100a and signal conditioner 102a decrease to a value of zero and terminates current to the corresponding inductor coil 50.
  • the summer 100b provides an output voltage of zero which causes the Bo signal to power unit to decrease to a value of zero and terminate the current to the inductor coil 51.
  • the present invention monitors the temperature of a pair of articles being heated by induction currents, controls the rate of heating and the welding temperatures of the articles. When the articles reach proper welding temperatures the inductor coils are removed from a gap between the articles and the articles forced together to form a welded pair.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Induction Heating (AREA)
US06/896,904 1986-08-11 1986-08-11 Dual induction heating pressure welding apparatus having a control circuit Expired - Fee Related US4717801A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US06/896,904 US4717801A (en) 1986-08-11 1986-08-11 Dual induction heating pressure welding apparatus having a control circuit
AU74432/87A AU590090B2 (en) 1986-08-11 1987-06-16 Dual induction heating pressure welding control circuit
CA000540006A CA1279904C (en) 1986-08-11 1987-06-18 Dual induction heating pressure welding control circuit
JP62161403A JPS6348790A (ja) 1986-08-11 1987-06-30 二重式誘導加熱圧接制御回路
FR8709721A FR2602445B1 (fr) 1986-08-11 1987-07-08 Circuit de reglage de chauffage par induction pour soudage
GB8718592A GB2193917B (en) 1986-08-11 1987-08-06 A control system for an induction heating welding apparatus
DE19873726586 DE3726586A1 (de) 1986-08-11 1987-08-10 Schaltungsanordnung zum steuern eines induktionsaufheizens zweier gegenstaende
IT21625/87A IT1222474B (it) 1986-08-11 1987-08-10 Doppio circuito di controllo per la saldatura a pressione con riscaldamento per induzione

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/896,904 US4717801A (en) 1986-08-11 1986-08-11 Dual induction heating pressure welding apparatus having a control circuit

Publications (1)

Publication Number Publication Date
US4717801A true US4717801A (en) 1988-01-05

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Application Number Title Priority Date Filing Date
US06/896,904 Expired - Fee Related US4717801A (en) 1986-08-11 1986-08-11 Dual induction heating pressure welding apparatus having a control circuit

Country Status (8)

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US (1) US4717801A (cs)
JP (1) JPS6348790A (cs)
AU (1) AU590090B2 (cs)
CA (1) CA1279904C (cs)
DE (1) DE3726586A1 (cs)
FR (1) FR2602445B1 (cs)
GB (1) GB2193917B (cs)
IT (1) IT1222474B (cs)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5240167A (en) * 1990-03-02 1993-08-31 Societe Nationale d'Etude et de Construction de Motors d'Aviation (S.N.E.CM.A.) Friction welding method with induction heat treating
US5294769A (en) * 1990-10-03 1994-03-15 Daihen Corporation Electric joining method of material including ceramics
US5396050A (en) * 1990-08-02 1995-03-07 Kawasaki Steel Corporation Method of joining steel sheet bars and a joining apparatus
US5414247A (en) * 1993-12-29 1995-05-09 The Boeing Company Hot melt induction heater and method
US5506386A (en) * 1993-11-30 1996-04-09 Elpatronic Ag Simultaneous temperature measurements on laser welded seams with at least two pyrometers in relation to monitoring process parameters and weld quality
US5886325A (en) * 1996-12-18 1999-03-23 Gnb Technologies, Inc. System and method for controlling the degree of heating experienced by a work coil in an induction heating generator
US5902507A (en) * 1997-03-03 1999-05-11 Chrysler Corporation Closed loop temperature control of induction brazing
WO2001093641A1 (en) * 2000-06-02 2001-12-06 Holland Company Induction heating of rail welds
CN103521909A (zh) * 2013-10-31 2014-01-22 北京石油化工学院 一种液相扩散焊机
US20140150965A1 (en) * 2011-05-27 2014-06-05 A&R Carton Lund AB Method for manufacturing a container comprising sealing of container parts
US20220040782A1 (en) * 2020-08-04 2022-02-10 Paul Po Cheng Methods and systems for cladding

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19808023A1 (de) * 1998-02-26 1999-09-02 Bayerische Motoren Werke Ag Vorrichtung zum induktiven Erwärmen zur stoffschlüssigen Verbindung zweier Werkstücke
EP3388385B1 (de) * 2017-04-12 2021-09-08 EPSILON Kran GmbH. Rotationsantrieb
DE102019210831B4 (de) 2019-07-22 2024-01-18 Audi Ag Schweißen einer Hybridbremsscheibe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892914A (en) * 1958-07-02 1959-06-30 Magnetic Heating Corp Methods and apparatus for butt welding
US3007022A (en) * 1959-12-09 1961-10-31 Combustion Eng Compact pressure induction welding apparatus for portable and other use
US4012616A (en) * 1975-01-02 1977-03-15 General Electric Company Method for metal bonding
US4327265A (en) * 1979-04-23 1982-04-27 Siemens Aktiengesellschaft Method for producing one or more contact connections between a lacquer-insulated wire and one or more contact parts of an electric component

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE914169C (de) * 1944-02-04 1954-06-28 Deutsche Edelstahlwerke Ag Stumpfschweissverfahren
FR2125620A1 (en) * 1971-02-19 1972-09-29 Usm Corp Hf welding rig - with automatic setting of variable capacitor plate to suit workpiece station
JPS6046213B2 (ja) * 1982-09-20 1985-10-15 鉄建建設株式会社 急勾配斜面を有する地山または既設盛土の安定工法
JPS61135490A (ja) * 1984-12-06 1986-06-23 Nippon Steel Corp 高周波溶接入熱自動制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892914A (en) * 1958-07-02 1959-06-30 Magnetic Heating Corp Methods and apparatus for butt welding
US3007022A (en) * 1959-12-09 1961-10-31 Combustion Eng Compact pressure induction welding apparatus for portable and other use
US4012616A (en) * 1975-01-02 1977-03-15 General Electric Company Method for metal bonding
US4327265A (en) * 1979-04-23 1982-04-27 Siemens Aktiengesellschaft Method for producing one or more contact connections between a lacquer-insulated wire and one or more contact parts of an electric component

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5240167A (en) * 1990-03-02 1993-08-31 Societe Nationale d'Etude et de Construction de Motors d'Aviation (S.N.E.CM.A.) Friction welding method with induction heat treating
US5396050A (en) * 1990-08-02 1995-03-07 Kawasaki Steel Corporation Method of joining steel sheet bars and a joining apparatus
US5294769A (en) * 1990-10-03 1994-03-15 Daihen Corporation Electric joining method of material including ceramics
US5506386A (en) * 1993-11-30 1996-04-09 Elpatronic Ag Simultaneous temperature measurements on laser welded seams with at least two pyrometers in relation to monitoring process parameters and weld quality
US5414247A (en) * 1993-12-29 1995-05-09 The Boeing Company Hot melt induction heater and method
US5886325A (en) * 1996-12-18 1999-03-23 Gnb Technologies, Inc. System and method for controlling the degree of heating experienced by a work coil in an induction heating generator
US5902507A (en) * 1997-03-03 1999-05-11 Chrysler Corporation Closed loop temperature control of induction brazing
WO2001093641A1 (en) * 2000-06-02 2001-12-06 Holland Company Induction heating of rail welds
US20050173419A1 (en) * 2000-06-02 2005-08-11 Miller Richard F. Induction heating of rail welds
US7253380B2 (en) * 2000-06-02 2007-08-07 Holland Lp Induction heating of rail welds
US20140150965A1 (en) * 2011-05-27 2014-06-05 A&R Carton Lund AB Method for manufacturing a container comprising sealing of container parts
CN103521909A (zh) * 2013-10-31 2014-01-22 北京石油化工学院 一种液相扩散焊机
US20220040782A1 (en) * 2020-08-04 2022-02-10 Paul Po Cheng Methods and systems for cladding

Also Published As

Publication number Publication date
IT1222474B (it) 1990-09-05
FR2602445A1 (fr) 1988-02-12
AU7443287A (en) 1988-02-18
IT8721625A0 (it) 1987-08-10
GB8718592D0 (en) 1987-09-09
JPS6348790A (ja) 1988-03-01
AU590090B2 (en) 1989-10-26
CA1279904C (en) 1991-02-05
DE3726586C2 (cs) 1993-03-18
DE3726586A1 (de) 1988-02-25
FR2602445B1 (fr) 1994-12-09
GB2193917A (en) 1988-02-24
GB2193917B (en) 1989-12-28

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Owner name: FMC CORPORATION, CHICAGO, IL, A DE CORP.

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